Development of new geochemical tracer using stable and radiogenic cerium isotopes

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New geochemical tracer for lithogenic elements was development by using stable and radiogenic cerium isotopes, and adopted to environmental sample, river and seawater. Double spike method using thermal ionization mass spectrometry and external standard method using MC-ICP-MS were examined. In order to seawater sample, double spike method was suitalbe for environmental sample, because of correction to mass dependent fractionation during chemical separation. Requied sample size was 100ng to achieve 0.015% of anaylytical error. Proposed method was adopted for analysis of river and seawater. Estuary and surface seawater samples showed distinct isotopic fractionation. These variations were though to be depends on the removal process. Nd isotopic fractionation was consistent with those of Ce. It suggested that influence of the redox process was relatively small to the isotopic fractionations.